Leering Emblem gives +2/+2 all the time in addition to its triggered ability.
Goblin Ringleader gets you some goblins, but doesn't reveal the top 4 cards of your library when it enters the battlefield.
My Goblin tokens are not getting the +1/+1 and mountainwalk from my
Goblin King in play. Instead they get double mountainwalk, I assume one from each King in play (there's 2). EDIT: After refreshing the window, the tokens are now 3/3, so it may have been either that the tokens didn't show their true P/T or they weren't updated right away like other cards in play were.
EDIT 2: This is just odd. The goblin cards in play revert to their original P/T (at least the numbers shown at the bottom right show this) when the AI casts a creature, but get +2/+2 again suddenly during the beginning of AI's attack phase.